Get Acid Rain Research: Do We Have Enough Answers? PDF

By J.W. Erisman, G.J. Heij

ISBN-10: 0444820388

ISBN-13: 9780444820389

Representing the complaints of the foreign Speciality convention ''Acid Rain study; will we have adequate answers?'', this e-book presents a precious end to the coordinated examine on acidification within the Netherlands from 1985 to 1994. The booklet specializes in atmospheric deposition, results of acid deposition on woodland ecosystems within the Netherlands, and destiny acidification study. precise cognizance is given to: trace gases; ammonia; and particle deposition; and the general evaluate of deposition a lot to ecosystems and soils can also be discussed.

This quantity may be beneficial to environmental scientists, ecologists, and people taken with atmospheric science/pollution

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The measurements were made from a 57 m tall mast in a stand of 24 m tall beech (Fagus sylvatica) trees. The instruments for eddy correlation measurements were placed a t 41 m. There was a good (500 m) fetch in the sector from ENE to SSE. There were no local sources of pollution in this direction since the forest is bordering the Baltic Sea. The incoming air-masses thus carry pollutants from distant sources in Poland and eastern Germany. 2 Calculations Fluxes were measured by the eddy correlation method and calculated from the equation: where F, is the flux of the compound in question, w the vertical wind velocity and C ( z ) the concentration of the compound a t the measurement height (z).

12 ppb m/s. The average 0 3 concentration was equal to 35 ppb. The average deposition velocity was 7 mm/s. The median canopy resistance calculated from the measurements was 150 s/m. A more detailed statistical treatment of the date is given in [lo]. These results fit quite well with literature data. Greenhut [ 131 reports aircraft measurements over coniferous forest in southern New Jersey with an average canopy resistance of 50 to 400 s/m. Lenshow [14] reports a canopy resistance of 50 s/m.

Only between 24 and 35 metre the difference can be observed well above the detection limit. In order to reduce the large effect of outliers a robust statistical treatment is required. Therefore several averaging procedures were compared [lo]. The larger temperature data set showed less scatter and was used as a database to test these procedures. Best results were obtained using a robust statistical method proposed by the Analytical Methods Committee [17]. With this method the average is calculated on the basis of the 50 and 75 percentile values thereby minimising the influence of outliers.

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Acid Rain Research: Do We Have Enough Answers? by J.W. Erisman, G.J. Heij

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